Punjabi is a tonal language. To add the tonal symbol. please hold ALT key and type the code from the below list.

Type the following codes to get grave accents:

à = 0224; À = 0192

è = 0232; È = 0200

ì = 0236; Ì = 0204

ò = 0242; Ò = 0210

ù = 0249; Ù = 0217

Type the following codes to get acute accents:

á = 0225; Á = 0193

é = 0233; É = 0201

í = 0237; Í = 0205

ó = 0243; Ó = 0211

ú = 0250; Ú = 0218

ý = 0253; Ý = 0221

The more can be found here. if the alt does not work, simply copy and paste.

U+0100 Latin Capital Letter A with macron (Ā) followed by a combining acute ( ́) produces Ā́.
U+0101 Latin Small Letter A with macron (ā) followed by a combining acute ( ́) produces ā́.
U+012A Latin Capital Letter I with macron (Ī) followed by a combining acute ( ́) produces Ī́.
U+012B Latin Small Letter I with macron (ī) followed by a combining acute ( ́) produces ī́.